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btrfs-progs: fi usage: use one formula for chunk size calculation

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The profile descriptions allow us to use a single formula to calculate
chunk size. Right now there are no profiles with parity (raid5-like) and
sub_stripes (raid10-like), which makes it easier.

- parity stripes are subtracted from the total count
- then divided by number of sub stripes

Practically speaking, 1:1 copy profiles do not have any adjustments.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2021-10-12 17:29:06 +02:00
parent 7d10a07455
commit 7674317139
1 changed files with 7 additions and 11 deletions
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18
cmds/filesystem-usage.c
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@ -810,17 +810,13 @@ int load_chunk_and_device_info(int fd, struct chunk_info **chunkinfo,
*/
static u64 calc_chunk_size(struct chunk_info *ci)
{
if (ci->type & BTRFS_BLOCK_GROUP_RAID0)
return ci->size / ci->num_stripes;
else if (ci->type & BTRFS_BLOCK_GROUP_RAID1_MASK)
return ci->size ;
else if (ci->type & BTRFS_BLOCK_GROUP_DUP)
return ci->size ;
else if (ci->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
return ci->size / (ci->num_stripes - btrfs_bg_type_to_nparity(ci->type));
else if (ci->type & BTRFS_BLOCK_GROUP_RAID10)
return ci->size / (ci->num_stripes / btrfs_bg_type_to_sub_stripes(ci->type));
return ci->size;
u32 div;
/* No parity + sub_stripes, so order of "-" and "/" does not matter */
div = (ci->num_stripes - btrfs_bg_type_to_nparity(ci->type)) /
btrfs_bg_type_to_sub_stripes(ci->type);
return ci->size / div;
}
/*